<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <!-- 适配手机端 -->
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>组件实例三大属性 props</title>
</head>


<!-- react核心库 -->
<script src="../React-js/react.development.js"></script>
<!-- 操作DOM支持库 -->
<script src="../React-js/react-dom.development.js"></script>
<!-- babel转换库  jsx-js -->
<script src="../React-js/babel.min.js"></script>


<body>

    <div id="test"></div>

    <script type="text/babel">
        class RefDemo extends React.Component {
            render() {
                return (
                    <div>
                        
                        <input ref="inputshow" type="text" />
                        <button onClick={this.showName}>执行</button>
                    </div>
                )

            }
            showName = () => {
                // ref 字符串的写法 性能问题 官方文档不建议使用
                const value = this.refs.inputshow.value
                alert(`输出值为：${value}`)
            }
        }

        ReactDOM.render(<RefDemo />, document.getElementById('test'))

    </script>
</body>

</html>